[Gmsh] making physical surfaces over a stl surface

[Christophe Geuzaine]

On 21 Jun 2013, at 12:45, "Madehkhaksar, F. (Forough)" <F.Madehkhaksar at uu.nl> wrote:

> Hello all,
> 
> I faced a problem with work with stl formats. I need to make volume mesh and import it in a FEM solver. I can do it by merge stl file and define a volume and then make 3D meshing. but after importing in FEM solver I don't have access to physical information of surfaces and volumes. I need to have my part not only as a physical object also as a set of physical faces (surfaces). I mean I need to chose specific surfaces (face of a volume element that belongs to surface of object) to apply boundary conditions, but my object has an overall surface. 
> attachments are stl information and my effort to make a physical object with volume meshes. but still I don't have access to the surfaces that define the volume. How can I define physical surfaces on my object?
> It is very kind of you if help me with this problem.

You could use the "Mesh->Reclassify 2D" tool to reclassify parts of the boundary surface.

> 
> Best regards,
> Forough MadehKhaksar, Ph.D. Researcher
> Department of Information and Computing Sciences, Utrecht University
> Games and Virtual Worlds research group
> Princetonplein 5, 3584 CC Utrecht, The Netherlands
> E-mail: 
> F.Madehkhaksar at uu.nl 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine